linux-kernel - [PATCH 2/5] aio: Export aio_nr_lock and aio_max

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Date:   Mon, 04 Dec 2017 19:13:09 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     axboe@...nel.dk, bcrl@...ck.org, viro@...iv.linux.org.uk,
        tj@...nel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org, oleg@...hat.com,
        ktkhai@...tuozzo.com
Subject: [PATCH 2/5] aio: Export aio_nr_lock and aio_max_nr initial value to
 include/linux/aio.h

Next patch will use the values in more files, so let's make them visible external.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 fs/aio.c            |    4 ++--
 include/linux/aio.h |    4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 04209c0561b2..9dc98a29077c 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -188,10 +188,10 @@ struct aio_kiocb {
 	struct eventfd_ctx	*ki_eventfd;
 };
 
+DEFINE_SPINLOCK(aio_nr_lock);
 /*------ sysctl variables----*/
-static DEFINE_SPINLOCK(aio_nr_lock);
 unsigned long aio_nr;		/* current system wide number of aio requests */
-unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
+unsigned long aio_max_nr = AIO_NR_DEF; /* system wide maximum number of aio requests */
 /*----end sysctl variables---*/
 
 static struct kmem_cache	*kiocb_cachep;
diff --git a/include/linux/aio.h b/include/linux/aio.h
index 9d8aabecfe2d..5dda2663802f 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -10,6 +10,10 @@ struct mm_struct;
 
 #define KIOCB_KEY		0
 
+#define AIO_NR_INF		(-1UL)
+#define AIO_NR_DEF		0x10000
+
+extern spinlock_t aio_nr_lock;
 typedef int (kiocb_cancel_fn)(struct kiocb *);
 
 /* prototypes */